>First save the output into a variable in which you have the desired
>output except for id="?" then use a node-set extension function 
>to apply an identity transform together with the extra rule

><xsl:template match="*[@id='?@']">
>  <xsl:copy>
>  <xsl:copy-of select="@*"/>
>  <xsl:attribute name="id">
>   ....<xsl:number level="any" count="*[@id="'?']"/>
>  </xsl:attribute>
>  <xsl:apply-templates/>
> </xsl:template>

Thanks for your help, however I think its going to be easier to do it in the
post-xslt processing - Cheers,
Matt
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